Process and apparatus for calcining chemical products.



APPLICATION FILED APR. 30, I915.

Patenfed Feb. 29, 1916.

M wi /M A TTORN/JYS.

' of the heutover the entire lowe" ELL lace ,1 Brookline, in i State of lil" re win new and use 0- ements in rrc-m s esses and Appsrrtt' lolcining; Clicinicul Products, or which the lollowiug s 513801-- fication.

The of this invention to provide ena simple antl ci'iicieut trating and calcining c typical product CllOS .3 aluminum sulfate.

- 'lcr coinciziczil preclu: Ior illustration t ng? as inventicm also includes the novel prores involved.

A prefc. 1. l 0; up ing the compcnyiug (link Figure l is a plan I parts being broken away; central vertical section thereof.

Referring to said drawii 1 re 1 a. plate which is preferably oi: cast iron and is revclublv n'iouutecl. As illustrated, the plate l is carried by a. central vertical upwardlyextencling shaft 2, supported. in suitable bearings 3, 3 and adapted to be re slowly by the lmvel-geur l and gearing 5. The plate 1 is slightly co H present a. concave upper nice. lee oischurging means for the calcined preci comprise fixed scrapers 3 (l1 stantially radially from the center to circumference; and a. screw-convcyer of ice 7 equivalent mechanical clev parallel to the scraper 6 on surface of the plate, and scr the deposit looscne-fl by the so the periphery of the plate, and it into 2L cross-conveyer S.

Beneath the plate 1 is a coil or other suitable furnace in the form Gil an. annulus S, constructed to alter-fl an even 6 n rl. the upper L0 move to Word.

tr: h ution sub once. \s illustrated, the m 4h- L- cit ardly through :1. n flue l2 lot. i er his form of l'or exm'nple it etc num being used icy tl;

heat-economize holler 13, the

11, which to the size, n ce of rr cs1. zeseuoor of the sulfate sol-ulse desired.

a suitable degree, say re or 1S kept fluid tank ll, and 1s per strun pends which in practice may, the specific mete chosen for illustration, he just below a l heat. strong solution thus {lisc :zn ed. upon the periohery of the plate ilows'towmxrl the center, meantime evaporating and. depositing a crust ml aluminum sulfu' During the hula-nee of the rotation this crust is calcined, is finally loosened the and removed the conveyer lt is thereby cleliverecl to the conveyer 8, .rvhich discharges it either directly into the podium-*- .l'or shipment, or into suitable mills ilesireil to nulverize it.

oi oi ti; the aluminum sulally from the peripheral portion cl cl plate in the'i orne of e lihu or strewn under" 3mg rapid 'iporation: the deposited crust 15 then calcined during the slow rotation of the plate, and is ultinmtcly loosened and broken up by the scrapl l 4 largely upon cinetion.

further important advantage resulting m) the use of :t shallow concave hearth wit-l1 pc it'eerl i as follows: Since the fluid e solidifies progressively in its flow it follows that the molten stream becomes smaller and. smaller it lioWs t0- wsrd the central portion of the plate. But since in its flow it moves toward the-center of the plate, tl s sz'ualler stream sutticesto cowr the surf Hence properly regulo ing the peripheral f with. reference ation and temperature of the plate, it i possihle to'ohtoi ticully uniform eposit over tl' crsge tank containing :ili n'un'uni sulfate solution,

of the plate. Obviously, a. similar'result cannot be secured if the molten charge fed. to the central portion of a plate and permitted to flow toward the periphery.

I claim 1. In a calcining furnace, the combination of a rotary plate having a concave up per face, means for heating said plate, means for supplying a fluid charge thereto, and discharging means acting to move the calcined charge from the inner portion of the plate toward its periphery.

2. In a calcining furnace, the combination of a rotary plate having a concave upper face, means for heating said plate, means for supplying a fluid charge thereto, and dis-- charging means comprising scraper and conveyor elements acting to detach the calclned charge from the plate and to move it from the inner portion of the plate toward the periphery thereof.

3. In a calcining furnace, the combination of a rotary plate having a concave upper face, means for heating said plate, means for supplying a fluid charge to the peripheral portion of the plate, and discharging means acting to move the calcined charge from. the inner portion of the plate toward its periphery.

a. In a calcining furnace, the combination of a rotary plate having a concave upper face in the form of a shallow cone, means for heating said plate, means for supplying a fluid charge to the peripheral. porti n of the plate, and discharging means acting to move the calcined charge from the inner portion of the plate toward its periphery.

5. In a calcining furnace, the combination of a rotary plate having a concave upper face, means for heating said plate, means for supplying a fluid charge to the peripheral portion of the plate, means for removing the calcined charge.

6. In a calcining furnace, tae combination of a rotary plate having a concave upper face in. the storm of a shallow cone, an annular furnace located beneath the periph eral portion of the plate and provided with a central flue, means for feeding a liuid charge to the peripheral portion oil the plate, and discharging means comprising scraper and conveyer elements acting; to detach the calcined charge from the plate and to move it from the inner portion of the plate to ward the periphery thereof.

7. The herein-described process of calcining chemical. products, which consists in heating moving surface to the temperature required for effecting calcination oi the said product feeding the product to said surface in fluid form and removing it therefrom in solid form, and causing the fluid and solid products to traverse said face in substantially opposite directions.

8. The herein-described process of cal: cining chemical products, which consists in heating a moving surface to the temperature required for effecting calcination of the said product, feeding the product to said surface in fluid form and removing it therefrom in solid form, the fluid material moving over the heated surface from the peripheral portion toward the center, and the calcined solid moving from the central portion toward the periphery.

In testimony whereof I affix m: in presence of two Witnesses.

l HENRY Hovhlen. Witnesses l. M. GRAHAM, M. V. QBnrnn.

v signature 

